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Finding the Fourth Proportional to 928.29, 1,388.91 and 579.99

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Solution

The fourth proportional to 928.29, 1,388.91 and 579.99 is: 867.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.29 : 1,388.91 = 579.99 : x
  2. Step 2: Convert to fraction form
    928.29/1,388.91 = 579.99/x
  3. Step 3: Cross multiply
    928.29x = 1,388.91 × 579.99
  4. Step 4: Simplify right side
    928.29x = 805,553.91
  5. Step 5: Solve for x
    x = 805,553.91/928.29
  6. Step 6: Final answer
    x = 867.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.